I have always had relatively quiet peacocks. I have never kept more than 1 male at a time with 2 females. I was taught early on that bonding them with chicken chicks and raising them together helps, 1)keep them close to home, and 2) keeps them quieter. For what ever reason, my peacock is fairly quiet. He doesn't make a sound in winter(He drops his tail in September which really humbles him) then squaks a bit in spring breeding, if his hens are not in sight. He screams when trucks come up my driveway(especially if they make that beep beep backup noise) and he yells after dark if any one slams the door.
He loves his chicken hens and protects them just like the peahens. I don't keep a rooster, as that would irritate him and the neighbors.
Just make sure he has some good high perches, and a mirror really helps. You can get a big plexiglass mirror for his cage, and that also helps keep them guiet I think.(just be careful not to face it into the sun- or you may blind him and burn your neighbor's house down!).
I invite my neighbors from coctails early summer(after the spring squaking) and hand out peacock feathers( and chicken eggs throughout the year). Keeps every one happy.